Which of the following statement is not true?

Group of answer choices

$($s$,$ Q$)$ system always orders the same quantity.

$($s$,$ S$)$ system will order enough to bring the inventory position back to the order up to level.

$($R$,$ S$)$ system only orders on the review date.

$($R$,$ s$,$ S$)$ system will order whenever the inventory position is at or below the reorder point s$.$